There is somewhere repo of developer, FernetMenta, but I think those source should perfectly fit XBMC plugin
I've updated the plugin:
http://anonscm.debian.org/gitweb/?p=pkg-vdr-dvb/vdr-plugin-vnsiserver.git;a=...
But I this is still considered unstable, so right now this is no candidate to be uploaded to Debian.
Tobias